Air Con: 70: - AC/ECC, AUT/defroster not working (Volvo V70 1998)

timebandit · Apr 12th, 2007, 12:01

Hi

Have tried to solve my problem but no luck.

Every morning when driving to work the AC OFF lights on the ECC panel in AUT fanspeed mode. Even the defroster/air to windows won't set to AC ON and work :/ Stays on AC OFF and minimal air.
After driving a mile or so the AC OFF switches to AC ON and everything works fine.
This problem is not fun when there's a lot of mist(?) on the windows.

If i set the fanspeed on the slide to ant other the AUT or off mode the AC ON will be on and fans are workign good, but not in AUT mode.

There are no error codes what so ever in the system so it's not easy for me to find whats wrong.

Anyone got some ideeas or tips etc what i can try do to etc?

Thanks in advance,

//Kensy

Georgey dee · Apr 12th, 2007, 12:20

I would get it re-gassed. They do suffer from a leaky exchangers but you wont know until you fill her up. When the gas gets low the pressure switch prevents the compressor from cutting in so if it's full of gas then it should cut in straight away.

timebandit · Apr 12th, 2007, 12:40

If the pressure is low the AC is turn off without any error code?

Does the pressure gets higher when driving? If so, then thats why the AC turns to AC ON after driving a bit.

Quote:

Originally Posted by Georgey dee

I would get it re-gassed. They do suffer from a leaky exchangers but you wont know until you fill her up. When the gas gets low the pressure switch prevents the compressor from cutting in so if it's full of gas then it should cut in straight away.

Georgey dee · Apr 12th, 2007, 12:59

I would say that you pressure is right on the limit of the switches operation. Is your compressor kicking in and then straight back off again (hunting) or when it kicks in does it spin for 20-30 seconds before it kicks off again?

after you've driven a bit with the compressor kicking in and out it can build up enough flow to allow the system to cope. But until you know your full of gas you'll be chaising your ar*e for ages.

timebandit · Apr 12th, 2007, 13:36

Thanks for the answers!

I will go get a date for checking the pressure etc.

To answer your question...

Every morning when is approx. under 10 degrees the AC OFF switch is lit.
When driving a few kilometres or miles sometimes the AC goes on (AC ON switch). And often it does go back to AC OFF and then AC ON again then to stay at AC ON.
Sometimes it does that sometimes it doesn't. But there isn't any delay within these "hunting". It's lower than 1 sek.

But I will try to get the pressure checked within this week.

//Kensy

Chris_Rogers · Apr 13th, 2007, 07:41

I've got this problem with my car at the moment, but it only occurs when the cabin temperature is low.
I think the problem is with the fan speed control potentiometer.
The AUT postion is at one end of the potentiometer travel, this is where the slider is positioned most of the time and is where open circuits are most likely to occur.
I've sprayed mine with electrical switch cleaner through the slot and worked the slider back and forth, this has helped with the problem.
The solution may be to open the ECC control unit up so that better access can be obtained for cleaning or to replace the unit.
You can measure the AC pressure in live data in the engine control module so you may be able to see if there is a problem there but i doubt it.
I've never been in a position to check the live data on the ECC itself when the problem is there because it's not that predictable, however I suspect of you check the live data from the fan speed control when the problem occurs you will see intermittent changes between AUT and '0'.

timebandit · Apr 13th, 2007, 10:11

This was very intresting info... I will try to remove the front panel of the ECC panel and try "cleaning" the most I can find to clean and see if it helps.

I do have a laptop and a OBDII cable but I don't have any software that can read live data. Do you know any software I can try without any big cost?

Do you also know how to measure the fan speed control part with a "multimeter" that can measure Volt, Ampere etc? This way I can se if there are any curent drops etc.

Quote:

Originally Posted by Chris_Rogers

I've got this problem with my car at the moment, but it only occurs when the cabin temperature is low.
I think the problem is with the fan speed control potentiometer.
The AUT postion is at one end of the potentiometer travel, this is where the slider is positioned most of the time and is where open circuits are most likely to occur.
I've sprayed mine with electrical switch cleaner through the slot and worked the slider back and forth, this has helped with the problem.
The solution may be to open the ECC control unit up so that better access can be obtained for cleaning or to replace the unit.
You can measure the AC pressure in live data in the engine control module so you may be able to see if there is a problem there but i doubt it.
I've never been in a position to check the live data on the ECC itself when the problem is there because it's not that predictable, however I suspect of you check the live data from the fan speed control when the problem occurs you will see intermittent changes between AUT and '0'.

Chris_Rogers · Apr 13th, 2007, 18:23

The only 'DIY' one I know off is here:

http://www.ilexa.co.uk/content/category/2/2/19/

Bridget · Jun 6th, 2010, 13:40

Hi,

I regassed the AC and changed from AUD to another cooling setting. The air is on maybe 5 minutes before turning itself off. Last night the defroster did the same thing and I was driving in the rain. I hit a curb and scared myself silly. I need a part number/fix for this problem, as it found out it can be deadly. Thanks!

Chris_Rogers · Jun 6th, 2010, 13:50

I suspect the compressor clutch needs adjusting, links to how to in this thread.

http://www.volvoforums.org.uk/showthread.php?t=97309

Apr 12th, 2007, 12:01	#1
timebandit Member Last Online: Sep 13th, 2017 21:39 Join Date: Apr 2007 Location: Göteborg	AC/ECC, AUT/defroster not working (Volvo V70 1998) Hi Have tried to solve my problem but no luck. Every morning when driving to work the AC OFF lights on the ECC panel in AUT fanspeed mode. Even the defroster/air to windows won't set to AC ON and work :/ Stays on AC OFF and minimal air. After driving a mile or so the AC OFF switches to AC ON and everything works fine. This problem is not fun when there's a lot of mist(?) on the windows. If i set the fanspeed on the slide to ant other the AUT or off mode the AC ON will be on and fans are workign good, but not in AUT mode. There are no error codes what so ever in the system so it's not easy for me to find whats wrong. Anyone got some ideeas or tips etc what i can try do to etc? Thanks in advance, //Kensy

Apr 12th, 2007, 12:20	#2
Georgey dee Premier Member Last Online: Feb 14th, 2024 18:36 Join Date: Dec 2005 Location: Norwich View Photos By: Georgey dee	I would get it re-gassed. They do suffer from a leaky exchangers but you wont know until you fill her up. When the gas gets low the pressure switch prevents the compressor from cutting in so if it's full of gas then it should cut in straight away. __________________ HAD; 440 GLT(Loved it), 850 GLT auto(Loved it), S70 2.5T(Nothing but problems!), 850R auto(Loved it!!), S60 D5 SE (Nothing but problems!) GOT; S60 D5 SE Lux Auto RAF Marham Track Day Co-Ord'

Apr 12th, 2007, 12:59	#4
Georgey dee Premier Member Last Online: Feb 14th, 2024 18:36 Join Date: Dec 2005 Location: Norwich View Photos By: Georgey dee	I would say that you pressure is right on the limit of the switches operation. Is your compressor kicking in and then straight back off again (hunting) or when it kicks in does it spin for 20-30 seconds before it kicks off again? after you've driven a bit with the compressor kicking in and out it can build up enough flow to allow the system to cope. But until you know your full of gas you'll be chaising your ar*e for ages. __________________ HAD; 440 GLT(Loved it), 850 GLT auto(Loved it), S70 2.5T(Nothing but problems!), 850R auto(Loved it!!), S60 D5 SE (Nothing but problems!) GOT; S60 D5 SE Lux Auto RAF Marham Track Day Co-Ord'

Jun 6th, 2010, 13:40	#9
Bridget New Member Last Online: Jun 6th, 2010 14:14 Join Date: Jun 2010 Location: Bloomfield, Michigan	V70RR Intermittent AC/Defrost problem Hi, I regassed the AC and changed from AUD to another cooling setting. The air is on maybe 5 minutes before turning itself off. Last night the defroster did the same thing and I was driving in the rain. I hit a curb and scared myself silly. I need a part number/fix for this problem, as it found out it can be deadly. Thanks!

Apr 12th, 2007, 13:36	#5
timebandit Member Last Online: Sep 13th, 2017 21:39 Join Date: Apr 2007 Location: Göteborg	Thanks for the answers! I will go get a date for checking the pressure etc. To answer your question... Every morning when is approx. under 10 degrees the AC OFF switch is lit. When driving a few kilometres or miles sometimes the AC goes on (AC ON switch). And often it does go back to AC OFF and then AC ON again then to stay at AC ON. Sometimes it does that sometimes it doesn't. But there isn't any delay within these "hunting". It's lower than 1 sek. But I will try to get the pressure checked within this week. //Kensy

Apr 13th, 2007, 07:41	#6
Chris_Rogers VOC Member Last Online: Apr 10th, 2017 16:55 Join Date: Jan 1970 Location: South Kent Coast	I've got this problem with my car at the moment, but it only occurs when the cabin temperature is low. I think the problem is with the fan speed control potentiometer. The AUT postion is at one end of the potentiometer travel, this is where the slider is positioned most of the time and is where open circuits are most likely to occur. I've sprayed mine with electrical switch cleaner through the slot and worked the slider back and forth, this has helped with the problem. The solution may be to open the ECC control unit up so that better access can be obtained for cleaning or to replace the unit. You can measure the AC pressure in live data in the engine control module so you may be able to see if there is a problem there but i doubt it. I've never been in a position to check the live data on the ECC itself when the problem is there because it's not that predictable, however I suspect of you check the live data from the fan speed control when the problem occurs you will see intermittent changes between AUT and '0'.

Apr 13th, 2007, 18:23	#8
Chris_Rogers VOC Member Last Online: Apr 10th, 2017 16:55 Join Date: Jan 1970 Location: South Kent Coast	The only 'DIY' one I know off is here: http://www.ilexa.co.uk/content/category/2/2/19/

Jun 6th, 2010, 13:50	#10
Chris_Rogers VOC Member Last Online: Apr 10th, 2017 16:55 Join Date: Jan 1970 Location: South Kent Coast	I suspect the compressor clutch needs adjusting, links to how to in this thread. http://www.volvoforums.org.uk/showthread.php?t=97309

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